k3d/share/shaders/k3d_superplank.sl:87:  float grain_s, grain_t, ring_s, ring_t, plank_s, plank_t;
k3d/share/shaders/k3d_superplank.sl:232:	  grain_t = tt * grainscale;
k3d/share/shaders/k3d_superplank.sl:233:	  r2 = 1.3 - noise(12 * grain_s, grain_t);
